River-Floodplain system

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Table of contents

1. Introduction générale
1. General introduction
Chapter 2. Nitrogen cycling, river-floodplain system, modelling approach.
2.1.1 Nitrogen
2.1.2 Nitrate pollution in the aquatic ecosystems
2.1.3 Denitrification
2.2 River-Floodplain system
2.2.1 Hyporheic zone (HZ)
2.2.2 Riparian zone
2.2.3 Biogeochemistry cycling
2.3 Modelling approach of river-floodplain system
2.3.1 Models of river-floodplain system
2.3.2 Catchment scale model and denitrification
2.4 Objective
Chapter 3. Material and methods.
3.1 Initial SWAT model
3.1.1 Hydrology in SWAT model
3.1.1.1 The hydrologic processes in HRU
3.1.1.2 The hydrologic processes in the channel
3.1.2 Nitrogen cycling in SWAT model
3.1.2.1 The nitrogen cycling processes in HRU
3.1.3 Organic Carbon in SWAT model
3.1.4 Denitrification in SWAT model
3.2 From SWAT to SWAT-LUD
3.2.1 SWAT-LU model
3.2.2 SWAT-LUD model
3.3 Study site
3.3.1 The Garonne River
3.3.2 Floodplain area in the middle section of the Garonne River
3.3.3 Monbéqui
Chapter 4. Improved simulation of river water and groundwater exchange in an alluvial plain using the SWAT model.
4.1 Introduction
4.2 Methodology
4.2.1 SWAT model
4.2.2 Model development
4.2.3 Study area
4.2.4 Landscape Unit parameters
4.2.5 Calibration and validation
4.3 Results
4.3.1 Calibrated parameters
4.3.2 Groundwater levels
4.3.3 Water exchange between surface water and groundwater
4.4 Discussion
4.5 Conclusions
Chapter 5. Assessment of the denitrification process in alluvial wetlands at floodplain scale using SWAT model.
5.1 Introduction
5.2 Methodology
5.2.1 SWAT-LUD model
5.2.2 Nitrogen cycle in the SWAT-LUD model
5.2.3 Organic carbon in SWAT-LUD
5.2.4 Study site
5.2.5 LU parameters
5.2.6 Calibration and evaluation of the SWAT-LUD model
5.3 Results
5.3.1 Calibrated parameters
5.3.2 STICS and SWAT-LUD model comparison
5.3.3 Nitrate concentrations in shallow aquifer
5.3.4 DOC concentrations in the shallow aquifer
5.3.5 Denitrification rate
5.3.6 The influence of hydraulic conditions and nitrate content on denitrification
5.4 Discussion
5.4.1 Denitrification
5.4.2 Influence of hydraulic conditions on denitrification
5.4.3 Nitrate dynamics
5.4.4 Influence of POC and DOC on denitrification
5.5 Conclusions
Chapter 6. Assessment of the surface water – groundwater exchange and shallow aquifer denitrification in the floodplain area using the SWAT-LUD model.
6.1 Introduction
6.2 Method
6.2.1 SWAT-LUD
6.2.2 Definition of LUs and distribution of HRUs
6.2.3 Study site
6.2.4 Subbasins and LUs parameters
6.2.5 Calibration and evaluation
6.3 Results
6.3.1 Calibrated parameters
6.3.2 Surface water – groundwater exchange
6.3.3 Denitrification
6.3.4 The influence of hydraulic conditions and nitrate content on denitrification
6.3.5 Channel nitrate balance
6.4 Discussion
6.5 Conclusion
6.6 Assessment of surface water-groundwater exchanges in alluvial floodplain at the catchment scale using SWAT model
6.6.1 Introduction
6.6.2 Method
6.6.3 Main results and discussion
6.6.4 Conclusion
7. Conclusions and perspectives
7.1 Conclusions
7.2 Perspectives
CONCLUSIONS